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 (
    87744, 91425, 86304, 86317, 91424, 87751, 
    91325, 86373, 86310, 86347, 86351, 
    87753, 86344, 86348, 86276, 86376, 
    86353, 86303, 86316, 86254, 86306, 
    86371, 86313, 86329, 86312, 86328, 
    86245, 86345, 86349, 87743, 86865, 
    87747, 86259, 86307, 91422, 91423, 
    87742, 86297, 86323, 86273, 86305, 
    86377, 86296, 86322, 86372, 87750, 
    86375, 87746
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00101

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 (87744,91425,86304,86317,91424,87751,91325,86373,86310,86347,86351,87753,86344,86348,86276,86376,86353,86303,86316,86254,86306,86371,86313,86329,86312,86328,86245,86345,86349,87743,86865,87747,86259,86307,91422,91423,87742,86297,86323,86273,86305,86377,86296,86322,86372,87750,86375,87746)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}