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 (
    97009, 97010, 97011, 97012, 97013, 97014, 
    97018, 97019, 97020, 97021, 97034, 
    97035, 97036, 97037, 97038, 97041, 
    97042, 97043, 97044, 97047, 97048, 
    97049, 97050, 97051, 97052, 97053, 
    97054, 97055, 97056, 97810, 97811, 
    97812, 97813, 97814, 97815, 97816, 
    97817, 97818, 97819, 97820, 97821, 
    97822, 97823, 97824, 97825, 97826, 
    97827, 97828
  ) 
  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 (97009,97010,97011,97012,97013,97014,97018,97019,97020,97021,97034,97035,97036,97037,97038,97041,97042,97043,97044,97047,97048,97049,97050,97051,97052,97053,97054,97055,97056,97810,97811,97812,97813,97814,97815,97816,97817,97818,97819,97820,97821,97822,97823,97824,97825,97826,97827,97828)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}