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 (
    86857, 84695, 88937, 87877, 85037, 91870, 
    90124, 90125, 90127, 90128, 88515, 
    88518, 87282, 87290, 88514, 88517, 
    88511, 91869, 91871, 91872, 91873, 
    91874, 91875, 85038, 92458, 92459, 
    92460, 92461, 92462, 92463, 92464, 
    92489, 92490, 92491, 92492, 92493, 
    92494, 92495, 86892, 90325, 88149, 
    88587, 92211, 92216, 92218, 92219, 
    92220, 92221
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00098

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 (86857,84695,88937,87877,85037,91870,90124,90125,90127,90128,88515,88518,87282,87290,88514,88517,88511,91869,91871,91872,91873,91874,91875,85038,92458,92459,92460,92461,92462,92463,92464,92489,92490,92491,92492,92493,92494,92495,86892,90325,88149,88587,92211,92216,92218,92219,92220,92221)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}