SELECT 
  cscart_product_descriptions.product_id, 
  cscart_product_descriptions.short_description, 
  IF(
    cscart_product_descriptions.short_description = '' 
    OR cscart_product_descriptions.short_description IS NULL, 
    cscart_product_descriptions.full_description, 
    ''
  ) AS full_description 
FROM 
  cscart_product_descriptions 
WHERE 
  cscart_product_descriptions.product_id IN (
    99659, 99660, 99661, 99662, 99663, 99664, 
    99665, 99666, 99667, 99668, 100144, 
    100145, 100146, 100147, 100148, 100149, 
    100292, 100293, 100294, 100295, 100480, 
    100481, 100482, 100483, 100484, 100485, 
    100486, 100487, 100488, 100489, 100490, 
    100491, 100492, 100493, 100494, 100495, 
    100496, 100497, 100498, 100499, 100504, 
    100505, 100506, 100507, 100508, 100509, 
    100510, 100511
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00099

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "26.87"
    },
    "table": {
      "table_name": "cscart_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": 48,
      "rows_produced_per_join": 48,
      "filtered": "100.00",
      "cost_info": {
        "read_cost": "22.07",
        "eval_cost": "4.80",
        "prefix_cost": "26.87",
        "data_read_per_join": "183K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "short_description",
        "full_description"
      ],
      "attached_condition": "((`nuie_scalesta_net`.`cscart_product_descriptions`.`product_id` in (99659,99660,99661,99662,99663,99664,99665,99666,99667,99668,100144,100145,100146,100147,100148,100149,100292,100293,100294,100295,100480,100481,100482,100483,100484,100485,100486,100487,100488,100489,100490,100491,100492,100493,100494,100495,100496,100497,100498,100499,100504,100505,100506,100507,100508,100509,100510,100511)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}