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 (
    464958, 464960, 464965, 464998, 465704, 
    465733, 465750, 465753, 466274, 466278, 
    466302, 466303, 467046, 467047, 467598, 
    467642, 468350, 468357, 468368, 468374, 
    468377, 468380, 468393, 468397
  ) 
  AND product_descriptions.lang_code = 'en'

Query time 0.00119

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "19.99"
    },
    "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": "17.59",
        "eval_cost": "2.40",
        "prefix_cost": "19.99",
        "data_read_per_join": "122K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "short_description",
        "full_description"
      ],
      "attached_condition": "((`goimagine`.`product_descriptions`.`product_id` in (464958,464960,464965,464998,465704,465733,465750,465753,466274,466278,466302,466303,467046,467047,467598,467642,468350,468357,468368,468374,468377,468380,468393,468397)) and (`goimagine`.`product_descriptions`.`lang_code` = 'en'))"
    }
  }
}