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 (
    32447, 32448, 32450, 32451, 32452, 32453, 
    32454, 32455, 32456, 32457, 32458, 
    32460, 32461, 32462, 32463, 32465, 
    32466, 32467, 32468, 32469, 32471, 
    32472, 32473, 32474, 32475, 32476, 
    32478, 32479, 32480, 32481, 32482, 
    32483
  ) 
  AND q_product_descriptions.lang_code = 'en'

Query time 0.00064

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 (32447,32448,32450,32451,32452,32453,32454,32455,32456,32457,32458,32460,32461,32462,32463,32465,32466,32467,32468,32469,32471,32472,32473,32474,32475,32476,32478,32479,32480,32481,32482,32483)) 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"
      ]
    }
  }
}