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 (
    1124294, 1660912, 1661197, 1658864, 
    1657833, 1660621, 1658593, 1658265, 
    1658811, 1664157, 1660401, 1660547, 
    1662451, 1658506, 1657840, 1658270, 
    1660154, 1663612, 1659246, 1658504, 
    1658427, 1663182, 1659564, 1661697, 
    1658557, 1659832, 1663613, 1659562, 
    1659920, 1657700, 1659922, 1661022
  ) 
  AND cscart_product_descriptions.lang_code = 'ro'

Query time 0.00653

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "38.38"
    },
    "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": 32,
      "rows_produced_per_join": 32,
      "filtered": "100.00",
      "cost_info": {
        "read_cost": "35.19",
        "eval_cost": "3.20",
        "prefix_cost": "38.39",
        "data_read_per_join": "122K"
      },
      "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 (1124294,1660912,1661197,1658864,1657833,1660621,1658593,1658265,1658811,1664157,1660401,1660547,1662451,1658506,1657840,1658270,1660154,1663612,1659246,1658504,1658427,1663182,1659564,1661697,1658557,1659832,1663613,1659562,1659920,1657700,1659922,1661022)) and (`maniamall_cscart`.`cscart_product_descriptions`.`lang_code` = 'ro'))"
    }
  }
}

Result