SELECT 
  cscart_product_descriptions.product_id, 
  cscart_product_descriptions.short_description, 
  IF(
    cscart_product_descriptions.short_description = '' 
    OR cscart_product_descriptions.short_description IS NULL, 
    cscart_product_descriptions.full_description, 
    ''
  ) AS full_description 
FROM 
  cscart_product_descriptions 
WHERE 
  cscart_product_descriptions.product_id IN (
    90227, 84051, 84059, 90281, 90289, 85963, 
    90177, 90178, 90247, 90255, 83939, 
    84083, 90207, 90218, 90179, 90133, 
    90229, 90244, 90280, 90288, 90194, 
    90254, 90262, 85962, 90228, 90243, 
    83938, 84082, 90169, 90174, 90175, 
    90206, 90217, 90193, 84050, 84058, 
    90226, 90237, 90242, 90253, 90261, 
    90186, 85961, 90252, 90260, 90251, 
    90259, 90279
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00048

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "21.63"
    },
    "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": 48,
      "rows_produced_per_join": 48,
      "filtered": "100.00",
      "cost_info": {
        "read_cost": "16.83",
        "eval_cost": "4.80",
        "prefix_cost": "21.63",
        "data_read_per_join": "183K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "short_description",
        "full_description"
      ],
      "attached_condition": "((`nuie_scalesta_net`.`cscart_product_descriptions`.`product_id` in (90227,84051,84059,90281,90289,85963,90177,90178,90247,90255,83939,84083,90207,90218,90179,90133,90229,90244,90280,90288,90194,90254,90262,85962,90228,90243,83938,84082,90169,90174,90175,90206,90217,90193,84050,84058,90226,90237,90242,90253,90261,90186,85961,90252,90260,90251,90259,90279)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}