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 (
    87325, 87336, 87337, 87348, 87349, 86482, 
    86484, 86758, 86760, 83582, 83583, 
    83584, 83585, 86479, 86755, 91118, 
    91119, 91204, 91205, 91259, 91260, 
    82615, 82617, 82625, 82626, 83418, 
    83420, 83490, 83491, 86651, 86720, 
    87300, 87301, 82612, 83411, 91149, 
    91150, 86480, 86756, 85073, 85159, 
    85205, 85251, 82613, 83416, 83031, 
    83033, 83588
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00111

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 (87325,87336,87337,87348,87349,86482,86484,86758,86760,83582,83583,83584,83585,86479,86755,91118,91119,91204,91205,91259,91260,82615,82617,82625,82626,83418,83420,83490,83491,86651,86720,87300,87301,82612,83411,91149,91150,86480,86756,85073,85159,85205,85251,82613,83416,83031,83033,83588)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}