SELECT 
  product_descriptions.product_id, 
  product_descriptions.short_description, 
  IF(
    product_descriptions.short_description = '' 
    OR product_descriptions.short_description IS NULL, 
    product_descriptions.full_description, 
    ''
  ) AS full_description 
FROM 
  product_descriptions 
WHERE 
  product_descriptions.product_id IN (
    480833, 480837, 481548, 481556, 481558, 
    482123, 482129, 482144, 482890, 482910, 
    482917, 483466, 483471, 484202, 484220, 
    484225, 484228, 484744, 484756, 484764, 
    484787, 484805, 485507, 485518
  ) 
  AND product_descriptions.lang_code = 'en'

Query time 0.00114

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "20.14"
    },
    "table": {
      "table_name": "product_descriptions",
      "access_type": "range",
      "possible_keys": [
        "PRIMARY",
        "product_id"
      ],
      "key": "PRIMARY",
      "used_key_parts": [
        "product_id",
        "lang_code"
      ],
      "key_length": "11",
      "rows_examined_per_scan": 24,
      "rows_produced_per_join": 24,
      "filtered": "100.00",
      "cost_info": {
        "read_cost": "17.75",
        "eval_cost": "2.40",
        "prefix_cost": "20.15",
        "data_read_per_join": "122K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "short_description",
        "full_description"
      ],
      "attached_condition": "((`goimagine`.`product_descriptions`.`product_id` in (480833,480837,481548,481556,481558,482123,482129,482144,482890,482910,482917,483466,483471,484202,484220,484225,484228,484744,484756,484764,484787,484805,485507,485518)) and (`goimagine`.`product_descriptions`.`lang_code` = 'en'))"
    }
  }
}