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 (32420, 42629, 42630, 42631, 42632) 
  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 
  216, 36

Query time 0.03847

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "6.45"
    },
    "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": 5,
              "rows_produced_per_join": 0,
              "filtered": "2.00",
              "cost_info": {
                "read_cost": "5.85",
                "eval_cost": "0.01",
                "prefix_cost": "5.86",
                "data_read_per_join": "265"
              },
              "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 (32420,42629,42630,42631,42632)) 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": 1,
              "filtered": "100.00",
              "using_index": true,
              "cost_info": {
                "read_cost": "0.10",
                "eval_cost": "0.19",
                "prefix_cost": "6.16",
                "data_read_per_join": "31"
              },
              "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": "0.01",
                "prefix_cost": "6.35",
                "data_read_per_join": "436"
              },
              "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": "0.01",
                "prefix_cost": "6.36",
                "data_read_per_join": "380"
              },
              "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": "0.01",
                "prefix_cost": "6.37",
                "data_read_per_join": "381"
              },
              "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": "0.01",
                "prefix_cost": "6.38",
                "data_read_per_join": "3"
              },
              "used_columns": [
                "product_id",
                "total"
              ]
            }
          },
          {
            "table": {
              "table_name": "prices",
              "access_type": "ref",
              "possible_keys": [
                "usergroup",
                "product_id",
                "lower_limit",
                "usergroup_id"
              ],
              "key": "usergroup",
              "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": "25.00",
              "using_index": true,
              "cost_info": {
                "read_cost": "0.06",
                "eval_cost": "0.00",
                "prefix_cost": "6.45",
                "data_read_per_join": "0"
              },
              "used_columns": [
                "product_id",
                "lower_limit",
                "usergroup_id"
              ],
              "attached_condition": "((`maniamall_cscart`.`prices`.`lower_limit` = 1) and (`maniamall_cscart`.`prices`.`usergroup_id` in (0,0,1)))"
            }
          }
        ]
      }
    }
  }
}

Result

product_id product stoc_intern pret_achizitie pret_revanzator gestiune
1232147 Roata masiva turceasca 350-7 -99 0.00 0.00 Y
1231457 Carburator ptu motocositoare cu gaura mica IEFTIN -99 0.00 0.00 Y
1282897 Suport prindere tableta pe tetiera auto vip mtv - SPT82214 -99 0.00 38.00 N
1231084 Baterie bucatarie DS-91012 23CM -99 0.00 0.00 Y
1231096 Cantar electronic de mana 50kg -99 0.00 0.00 Y
1214595 Aparat multifunctional anti-insecte si rozatoare 3in1, lampa UV, senzor de lumina, 5W, negru -99 60.14 69.81 Y
1231474 Suport coarne MTC 26mm -99 0.00 0.00 Y
1231195 Canea 1/2" -99 0.00 0.00 Y
1232266 Pudra de curatat cos de fum2X90 (Cosar) -99 0.00 0.00 Y
1338924 Suport telefon cu incarcator wireless S5 2in1 -99 40.00 62.00 N
1231338 Manusi ROSII CAUCIUC LUNGI 35cm (12pcs) -99 0.00 0.00 N
1662790 Bandă LED - alb cald - 1 m - cu baterii 3xAA - eChilipir -99 0.00 0.00 Y
1231494 Suport aparatoare 26mm (tablita) -99 0.00 0.00 Y
1232184 Mufa Teu 1/2"-5/8" SAYIM MD33 -99 0.00 0.00 Y
1108819 Folie Carbon 3D Alb, 1x1.5m, Tehnologie de Eliminare a Bulelor de Aer -99 14.41 45.00 Y
1232049 Intinzator lant drujba -99 0.00 0.00 Y
1231612 Robinet trecere fonta 1"" -99 0.00 0.00 Y
1232051 Cleste dezizolat cablu coaxial , RG58, RG59, RG6 -99 0.00 0.00 Y
1232167 Manusi de Gradinarit, cu 4 Gheare pentru Sapat -99 0.00 0.00 Y
1238120 Sticker auto parbriz Because Audi, alb -99 19.03 26.00 Y
1231458 Pompita amorsare carburator universala -99 0.00 0.00 Y
1231459 Kit carburator motocositoare -99 0.00 0.00 Y
1231377 Arc foarfec METAL -99 0.00 0.00 Y
1231215 Manometru hidrofor RADIAL -99 0.00 0.00 Y
1231569 Pompa stropit manuala (ieftina) 16L PANDORA -99 0.00 0.00 Y
1232092 Ulei lant drujba PREMIUM 1L -99 0.00 0.00 Y
1231160 Petice auto #09 -99 0.00 0.00 Y
1731849 Scai dublu cu banda dublu adeziva VELCRO ( pret / metru ) MRA36-040621-16 -99 4.09 0.00 N
1232054 Cleste dezizolat cablu coaxial, telefon, utp -99 0.00 0.00 Y
1232064 Sita pentru moara universala 2,0mm -99 0.00 0.00 Y
1108779 Folie carbon 3D Rosu, 1x1.5 m cu tehnologie de eliminare a bulelor de aer -99 0.00 54.00 Y
1108820 Folie Carbon 3D Albastru, 1x1.5m, Tehnologie de Eliminare a Bulelor de Aer -99 27.01 45.00 Y
1231839 Manusi SPUMA verzi, rosii (12pcs) -99 0.00 0.00 Y
1231181 Zavor lat nr.4 70mm -99 0.00 0.00 Y
1231476 Suport coarne MTC 26mm MARE -99 0.00 0.00 Y
1153203 Rama Adaptoare 2DIN compatibil Kia Sportage 2016-, Negru -99 118.07 137.88 Y