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 (
    88740, 91897, 91898, 91899, 92341, 92343, 
    92344, 85643, 88925, 88926, 88927, 
    91470, 92186, 92187, 92188, 92189, 
    92190, 92441, 82561, 85642, 86249, 
    88070, 88394, 82369, 85582, 86901, 
    90023, 90039, 90055, 90328, 90332, 
    90335, 90336, 90343, 90344, 92488, 
    91840, 91841, 91842, 91843, 91845, 
    91846, 91847, 82375, 87581, 87596, 
    87611, 88150
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00043

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 (88740,91897,91898,91899,92341,92343,92344,85643,88925,88926,88927,91470,92186,92187,92188,92189,92190,92441,82561,85642,86249,88070,88394,82369,85582,86901,90023,90039,90055,90328,90332,90335,90336,90343,90344,92488,91840,91841,91842,91843,91845,91846,91847,82375,87581,87596,87611,88150)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}