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 (
    87241, 87244, 87245, 87246, 87249, 87250, 
    87251, 86894, 92232, 92233, 92234, 
    92235, 92236, 92238, 92468, 92472, 
    92473, 92474, 84240, 88588, 84239, 
    92212, 92213, 92214, 92215, 92217, 
    92223, 92465, 92466, 92191, 84238, 
    92228, 92229, 92230, 92231, 92237, 
    92469, 92470, 92471, 91865, 85585, 
    92366, 92367, 92368, 92369, 92370, 
    92371, 92372
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00103

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 (87241,87244,87245,87246,87249,87250,87251,86894,92232,92233,92234,92235,92236,92238,92468,92472,92473,92474,84240,88588,84239,92212,92213,92214,92215,92217,92223,92465,92466,92191,84238,92228,92229,92230,92231,92237,92469,92470,92471,91865,85585,92366,92367,92368,92369,92370,92371,92372)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}