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 (
    1593, 1594, 1595, 1596, 1597, 1598, 1599, 
    1600, 1601, 1602, 1603, 1605, 1606, 
    1607, 1610, 1611, 1612, 1613, 1614, 
    1615, 1616, 1617, 1618, 1624, 1625, 
    1626, 1627, 1628
  ) 
  AND q_product_descriptions.lang_code = 'en'

Query time 0.00067

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "67.21"
    },
    "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": 28,
      "rows_produced_per_join": 28,
      "filtered": "100.00",
      "index_condition": "((`portal`.`q_product_descriptions`.`product_id` in (1593,1594,1595,1596,1597,1598,1599,1600,1601,1602,1603,1605,1606,1607,1610,1611,1612,1613,1614,1615,1616,1617,1618,1624,1625,1626,1627,1628)) and (`portal`.`q_product_descriptions`.`lang_code` = 'en'))",
      "cost_info": {
        "read_cost": "61.61",
        "eval_cost": "5.60",
        "prefix_cost": "67.21",
        "data_read_per_join": "106K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "short_description",
        "full_description"
      ]
    }
  }
}