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 (
    32817, 32818, 32819, 32820, 32821, 32822, 
    32823, 32824, 32825, 32826, 32827, 
    32828, 32829, 32830, 32831, 32832, 
    32833, 32834, 32835, 32836, 32837, 
    32838, 32839, 32840, 32841, 32842, 
    32843, 32844, 32845, 32846, 32847, 
    32848
  ) 
  AND q_product_descriptions.lang_code = 'en'

Query time 0.00074

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 (32817,32818,32819,32820,32821,32822,32823,32824,32825,32826,32827,32828,32829,32830,32831,32832,32833,32834,32835,32836,32837,32838,32839,32840,32841,32842,32843,32844,32845,32846,32847,32848)) 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"
      ]
    }
  }
}