SELECT 
  q_product_descriptions.product_id, 
  q_product_descriptions.short_description, 
  IF(
    q_product_descriptions.short_description = '', 
    q_product_descriptions.full_description, 
    ''
  ) AS full_description 
FROM 
  q_product_descriptions 
WHERE 
  q_product_descriptions.product_id IN (
    32484, 32485, 32486, 32487, 32488, 32489, 
    32490, 32491, 32492, 32493, 32494, 
    32495, 32496, 32497, 32499, 32500, 
    32501, 32502, 32503, 32504, 32505, 
    32506, 32507, 32508, 32509, 32510, 
    32511, 32512, 32513, 32514, 32515, 
    32516
  ) 
  AND q_product_descriptions.lang_code = 'en'

Query time 0.00099

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "76.81"
    },
    "table": {
      "table_name": "q_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": 32,
      "rows_produced_per_join": 32,
      "filtered": "100.00",
      "index_condition": "((`portal`.`q_product_descriptions`.`product_id` in (32484,32485,32486,32487,32488,32489,32490,32491,32492,32493,32494,32495,32496,32497,32499,32500,32501,32502,32503,32504,32505,32506,32507,32508,32509,32510,32511,32512,32513,32514,32515,32516)) and (`portal`.`q_product_descriptions`.`lang_code` = 'en'))",
      "cost_info": {
        "read_cost": "70.41",
        "eval_cost": "6.40",
        "prefix_cost": "76.81",
        "data_read_per_join": "122K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "short_description",
        "full_description"
      ]
    }
  }
}