SELECT 
  SQL_CALC_FOUND_ROWS products.product_id, 
  IF(
    shared_descr.product_id IS NOT NULL, 
    shared_descr.product, descr1.product
  ) as product, 
  stoc_intern, 
  pret_achizitie, 
  pret_revanzator, 
  gestiune 
FROM 
  cscart_products as products 
  LEFT JOIN cscart_product_options_inventory as inventory ON inventory.product_id = products.product_id 
  LEFT JOIN cscart_product_descriptions as descr1 ON descr1.product_id = products.product_id 
  AND descr1.lang_code = 'ro' 
  LEFT JOIN cscart_product_prices as prices ON prices.product_id = products.product_id 
  AND prices.lower_limit = 1 
  INNER JOIN cscart_products_categories as products_categories ON products_categories.product_id = products.product_id 
  INNER JOIN cscart_categories ON cscart_categories.category_id = products_categories.category_id 
  AND (
    cscart_categories.usergroup_ids = '' 
    OR FIND_IN_SET(
      0, cscart_categories.usergroup_ids
    ) 
    OR FIND_IN_SET(
      1, cscart_categories.usergroup_ids
    )
  ) 
  AND cscart_categories.status IN ('A', 'H') 
  LEFT JOIN cscart_ult_product_descriptions shared_descr ON shared_descr.product_id = products.product_id 
  AND shared_descr.company_id = 1 
  AND shared_descr.lang_code = 'ro' 
  LEFT JOIN cscart_product_popularity as popularity ON popularity.product_id = products.product_id 
WHERE 
  1 
  AND cscart_categories.category_id IN (
    30404, 30405, 30407, 30463, 30464, 30489, 
    30468, 30469, 30473, 30474, 30477, 
    30486, 30490, 30491, 30496, 30498, 
    30501, 30503, 30510, 30471, 30472, 
    30476, 30499, 30509, 30511, 30475, 
    30478, 30479, 30480, 30481, 30482, 
    30492, 30512, 30552, 30553, 30554, 
    30555, 30557, 30558, 30561, 30562
  ) 
  AND cscart_categories.company_id = 1 
  AND (
    CASE products.tracking WHEN 'O' THEN inventory.amount > 0 WHEN 'B' THEN products.amount > 0 ELSE 1 END
  ) 
  AND (
    products.usergroup_ids = '' 
    OR FIND_IN_SET(0, products.usergroup_ids) 
    OR FIND_IN_SET(1, products.usergroup_ids)
  ) 
  AND products.status IN ('A') 
  AND prices.usergroup_id IN (0, 0, 1) 
GROUP BY 
  products.product_id 
ORDER BY 
  popularity.total desc, 
  product_id ASC 
LIMIT 
  0, 32

Query time 0.00553

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "48.77"
    },
    "ordering_operation": {
      "using_filesort": true,
      "grouping_operation": {
        "using_temporary_table": true,
        "using_filesort": false,
        "nested_loop": [
          {
            "table": {
              "table_name": "inventory",
              "access_type": "system",
              "possible_keys": [
                "pc"
              ],
              "rows_examined_per_scan": 0,
              "rows_produced_per_join": 1,
              "filtered": "0.00",
              "const_row_not_found": true,
              "cost_info": {
                "read_cost": "0.00",
                "eval_cost": "0.10",
                "prefix_cost": "0.00",
                "data_read_per_join": "880"
              },
              "used_columns": [
                "product_id",
                "amount"
              ]
            }
          },
          {
            "table": {
              "table_name": "cscart_categories",
              "access_type": "range",
              "possible_keys": [
                "PRIMARY",
                "c_status",
                "p_category_id"
              ],
              "key": "PRIMARY",
              "used_key_parts": [
                "category_id"
              ],
              "key_length": "3",
              "rows_examined_per_scan": 41,
              "rows_produced_per_join": 0,
              "filtered": "2.00",
              "cost_info": {
                "read_cost": "43.80",
                "eval_cost": "0.08",
                "prefix_cost": "43.89",
                "data_read_per_join": "2K"
              },
              "used_columns": [
                "category_id",
                "company_id",
                "usergroup_ids",
                "status"
              ],
              "attached_condition": "((`maniamall_cscart`.`cscart_categories`.`company_id` = 1) and (`maniamall_cscart`.`cscart_categories`.`category_id` in (30404,30405,30407,30463,30464,30489,30468,30469,30473,30474,30477,30486,30490,30491,30496,30498,30501,30503,30510,30471,30472,30476,30499,30509,30511,30475,30478,30479,30480,30481,30482,30492,30512,30552,30553,30554,30555,30557,30558,30561,30562)) and ((`maniamall_cscart`.`cscart_categories`.`usergroup_ids` = '') or (0 <> find_in_set(0,`maniamall_cscart`.`cscart_categories`.`usergroup_ids`)) or (0 <> find_in_set(1,`maniamall_cscart`.`cscart_categories`.`usergroup_ids`))) and (`maniamall_cscart`.`cscart_categories`.`status` in ('A','H')))"
            }
          },
          {
            "table": {
              "table_name": "products_categories",
              "access_type": "ref",
              "possible_keys": [
                "PRIMARY",
                "pt"
              ],
              "key": "PRIMARY",
              "used_key_parts": [
                "category_id"
              ],
              "key_length": "3",
              "ref": [
                "maniamall_cscart.cscart_categories.category_id"
              ],
              "rows_examined_per_scan": 19,
              "rows_produced_per_join": 15,
              "filtered": "100.00",
              "using_index": true,
              "cost_info": {
                "read_cost": "0.80",
                "eval_cost": "1.60",
                "prefix_cost": "46.28",
                "data_read_per_join": "255"
              },
              "used_columns": [
                "product_id",
                "category_id"
              ]
            }
          },
          {
            "table": {
              "table_name": "products",
              "access_type": "eq_ref",
              "possible_keys": [
                "PRIMARY",
                "status"
              ],
              "key": "PRIMARY",
              "used_key_parts": [
                "product_id"
              ],
              "key_length": "3",
              "ref": [
                "maniamall_cscart.products_categories.product_id"
              ],
              "rows_examined_per_scan": 1,
              "rows_produced_per_join": 0,
              "filtered": "5.00",
              "cost_info": {
                "read_cost": "0.00",
                "eval_cost": "0.08",
                "prefix_cost": "47.88",
                "data_read_per_join": "3K"
              },
              "used_columns": [
                "product_id",
                "status",
                "amount",
                "usergroup_ids",
                "tracking",
                "stoc_intern",
                "pret_achizitie",
                "pret_revanzator",
                "gestiune"
              ],
              "attached_condition": "((0 <> (case `maniamall_cscart`.`products`.`tracking` when 'O' then <cache>((NULL > 0)) when 'B' then (`maniamall_cscart`.`products`.`amount` > 0) else 1 end)) and ((`maniamall_cscart`.`products`.`usergroup_ids` = '') or (0 <> find_in_set(0,`maniamall_cscart`.`products`.`usergroup_ids`)) or (0 <> find_in_set(1,`maniamall_cscart`.`products`.`usergroup_ids`))) and (`maniamall_cscart`.`products`.`status` = 'A'))"
            }
          },
          {
            "table": {
              "table_name": "shared_descr",
              "access_type": "eq_ref",
              "possible_keys": [
                "PRIMARY",
                "product_id",
                "company_id"
              ],
              "key": "PRIMARY",
              "used_key_parts": [
                "product_id",
                "lang_code",
                "company_id"
              ],
              "key_length": "13",
              "ref": [
                "maniamall_cscart.products_categories.product_id",
                "const",
                "const"
              ],
              "rows_examined_per_scan": 1,
              "rows_produced_per_join": 0,
              "filtered": "100.00",
              "cost_info": {
                "read_cost": "0.00",
                "eval_cost": "0.08",
                "prefix_cost": "47.96",
                "data_read_per_join": "3K"
              },
              "used_columns": [
                "product_id",
                "lang_code",
                "company_id",
                "product"
              ]
            }
          },
          {
            "table": {
              "table_name": "descr1",
              "access_type": "eq_ref",
              "possible_keys": [
                "PRIMARY",
                "product_id"
              ],
              "key": "PRIMARY",
              "used_key_parts": [
                "product_id",
                "lang_code"
              ],
              "key_length": "9",
              "ref": [
                "maniamall_cscart.products_categories.product_id",
                "const"
              ],
              "rows_examined_per_scan": 1,
              "rows_produced_per_join": 0,
              "filtered": "100.00",
              "cost_info": {
                "read_cost": "0.00",
                "eval_cost": "0.08",
                "prefix_cost": "48.04",
                "data_read_per_join": "3K"
              },
              "used_columns": [
                "product_id",
                "lang_code",
                "product"
              ]
            }
          },
          {
            "table": {
              "table_name": "popularity",
              "access_type": "eq_ref",
              "possible_keys": [
                "PRIMARY",
                "total"
              ],
              "key": "PRIMARY",
              "used_key_parts": [
                "product_id"
              ],
              "key_length": "3",
              "ref": [
                "maniamall_cscart.products_categories.product_id"
              ],
              "rows_examined_per_scan": 1,
              "rows_produced_per_join": 0,
              "filtered": "100.00",
              "cost_info": {
                "read_cost": "0.00",
                "eval_cost": "0.08",
                "prefix_cost": "48.12",
                "data_read_per_join": "25"
              },
              "used_columns": [
                "product_id",
                "total"
              ]
            }
          },
          {
            "table": {
              "table_name": "prices",
              "access_type": "ref",
              "possible_keys": [
                "usergroup",
                "product_id",
                "lower_limit",
                "usergroup_id"
              ],
              "key": "lower_limit",
              "used_key_parts": [
                "lower_limit",
                "product_id"
              ],
              "key_length": "6",
              "ref": [
                "const",
                "maniamall_cscart.products_categories.product_id"
              ],
              "rows_examined_per_scan": 1,
              "rows_produced_per_join": 0,
              "filtered": "50.00",
              "using_index": true,
              "cost_info": {
                "read_cost": "0.57",
                "eval_cost": "0.04",
                "prefix_cost": "48.77",
                "data_read_per_join": "9"
              },
              "used_columns": [
                "product_id",
                "lower_limit",
                "usergroup_id"
              ],
              "attached_condition": "(`maniamall_cscart`.`prices`.`usergroup_id` in (0,0,1))"
            }
          }
        ]
      }
    }
  }
}

Result

product_id product stoc_intern pret_achizitie pret_revanzator gestiune
1025473 Carburator HONDA GX 240 - MTO-GX0045 -99 0.00 0.00 Y
1026578 MAGNETOU GY6 125-150 - 11 POLI (DC:12V) - MTO-C17043.1 -99 0.00 0.00 Y
1024898 Ambielaj 1 (cu pana) HONDA GX 340-390" - MTO-GX0004 -99 0.00 0.00 Y
1025463 CAPAC TRANSMISIE GY6 125-150 - 43cm - MTO-A09030 -99 0.00 0.00 Y
1033122 SABOTI AMBREIAJ PIAGGIO CIAO 50 - MTO-B14003 -99 0.00 0.00 N
1025233 BORD KM SCUTER MARE - MTO-D24009 -99 0.00 0.00 Y
1033163 Segmenti HONDA GX 390 (88mm - 2mm) - MTO-GX0145 -99 0.00 0.00 Y
1026426 KIT PISTON PIAGGIO CIAO 50 (38.6mm;d=10mm) - MTO-A02033.1 -99 0.00 0.00 Y
1024946 AMBREIAJ PORNIRE VARIATOR PIAGGIO CIAO - MARE (MODEL CU VARIATOR) - MTO-B14004 -99 0.00 0.00 N
1033159 Segmenti HONDA GX 200 (70mm - 1.5mm) - MTO-GX0141 -99 0.00 0.00 N
1033259 SET SUPAPE ATV/MOPED 70 - MTO-A05004 -99 0.00 0.00 Y
1026437 KIT PISTON SUZUKI AD 50 (42.5mm,d=10mm) - MTO-A02044.4 -99 0.00 0.00 Y
1025681 CHIULASA GY6 125 - CU SUPAPE - MTO-A04005 -99 0.00 0.00 Y
1026177 GARNITURI CILINDRU SUZUKI KATANA/ APRILIA SR 50 - MTO-A06034 -99 0.00 0.00 Y
1026433 KIT PISTON PIAGGIO TYPHOON 50 (41mm;d=12mm) - MTO-A02029.2 -99 0.00 0.00 Y
1026779 PANA AMBIELAJ GY6 (13X2.5X3mm) - MTO-A07001.1 -99 0.00 0.00 N
1026434 KIT PISTON PIAGGIO TYPHOON 50 (42mm;d=12mm) - MTO-A02029.4 -99 0.00 0.00 Y
1026459 KIT POMPA APA PIAGGIO TYPHOON 50 - MTO-A12005 -99 0.00 0.00 Y
1033160 Segmenti HONDA GX 240 (73mm - 2mm) - MTO-GX0142 -99 0.00 0.00 Y
1032977 RAC GY6 50 (8T) - MTO-A09015 -99 0.00 0.00 Y
1033261 SET SUPAPE GY6 150 - MTO-A05003 -99 0.00 0.00 Y
1026455 KIT PISTON YAMAHA 50 (48mm;d=10mm) - MTO-A02020.1 -99 0.00 0.00 Y
1026422 KIT PISTON PEUGEOT BUXY 50 (40.5mm;d=12mm) - MTO-A02038.1 -99 0.00 0.00 Y
1033186 SEMILUNA YAMAHA/APRILIA/MINARELLI 50 (CURBATA) - MTO-A09012 -99 0.00 0.00 Y
1051338 AMBIELAJ YAMAHA JOG XH90 (CANELURI MARI) - MTO-A07009 -99 0.00 0.00 Y
1025178 BIELA YAMAHA JOG 50 - MTO-A07030 -99 0.00 0.00 Y
1026178 GARNITURI CILINDRU YAMAHA AM6 50 (APA) - MTO-A06015 -99 0.00 0.00 Y
1026450 KIT PISTON YAMAHA 50 (44mm;d=10mm) - MTO-A02018.2 -99 0.00 0.00 Y
1025838 CUREA 710 - MTO-B16016 -99 0.00 0.00 Y
1051424 GARNTITURI CILINDRU PIAGGIO NRG 50 4 COLTURI (APA) - MTO-A06021 -99 0.00 0.00 Y
1033184 SEMILUNA GY6 50 (8T;L=46.5mm) - MTO-A09009 -99 0.00 0.00 Y
1025840 CUREA 729 ROATA 12 - MTO-B16004 -99 0.00 0.00 Y