SELECT 
  cscart_product_descriptions.product_id, 
  cscart_product_descriptions.short_description, 
  IF(
    cscart_product_descriptions.short_description = '', 
    cscart_product_descriptions.full_description, 
    ''
  ) AS full_description, 
  cscart_product_descriptions.meta_keywords, 
  cscart_product_descriptions.meta_description, 
  cscart_product_descriptions.search_words, 
  cscart_product_descriptions.promo_text 
FROM 
  cscart_product_descriptions 
WHERE 
  cscart_product_descriptions.product_id IN (
    1128285, 1128289, 1129605, 1129852, 
    525901, 1128299, 1199097, 2055715, 
    1718556, 1128294, 1129606, 1444124, 
    1128290, 1199098, 1373431, 1722316, 
    1373435, 1373432, 1128108, 1199099, 
    1199095, 1129597, 1128097, 1129869, 
    1129863, 1128078, 1193387, 1198929, 
    1198866, 1129865, 1129867, 1198921, 
    1129873, 1129857, 1129861, 1129864, 
    2538988
  ) 
  AND cscart_product_descriptions.lang_code = 'ro'

Query time 0.09682

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "44.40"
    },
    "table": {
      "table_name": "cscart_product_descriptions",
      "access_type": "range",
      "possible_keys": [
        "PRIMARY",
        "product_id"
      ],
      "key": "PRIMARY",
      "used_key_parts": [
        "product_id",
        "lang_code"
      ],
      "key_length": "9",
      "rows_examined_per_scan": 37,
      "rows_produced_per_join": 37,
      "filtered": "100.00",
      "cost_info": {
        "read_cost": "40.70",
        "eval_cost": "3.70",
        "prefix_cost": "44.40",
        "data_read_per_join": "141K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "short_description",
        "full_description",
        "meta_keywords",
        "meta_description",
        "search_words",
        "promo_text"
      ],
      "attached_condition": "((`maniamall_cscart`.`cscart_product_descriptions`.`product_id` in (1128285,1128289,1129605,1129852,525901,1128299,1199097,2055715,1718556,1128294,1129606,1444124,1128290,1199098,1373431,1722316,1373435,1373432,1128108,1199099,1199095,1129597,1128097,1129869,1129863,1128078,1193387,1198929,1198866,1129865,1129867,1198921,1129873,1129857,1129861,1129864,2538988)) and (`maniamall_cscart`.`cscart_product_descriptions`.`lang_code` = 'ro'))"
    }
  }
}

Result