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 (
    101704, 101705, 101706, 101707, 101708, 
    101709, 101710, 101711, 101712, 101713, 
    101714, 101715, 101716, 101717, 101718, 
    101719, 101720, 101721, 101722, 101723, 
    101724, 101725, 101726, 101727, 101728, 
    101729, 101730, 101731, 101732, 101733, 
    101734, 101735, 101736, 101737, 101738, 
    101739, 101744, 101745, 101764, 101765, 
    101766, 101767, 101768, 101769, 101770, 
    101771, 101772, 101773, 101774, 101775, 
    101776, 101777, 101778, 101779, 101780, 
    101781, 101782, 101783, 101784, 101785, 
    101786, 101787, 101788, 101789, 101790, 
    101791, 101792, 101793, 101952, 101953, 
    101954, 101955
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00124

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "32.43"
    },
    "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": 72,
      "rows_produced_per_join": 72,
      "filtered": "100.00",
      "cost_info": {
        "read_cost": "25.23",
        "eval_cost": "7.20",
        "prefix_cost": "32.43",
        "data_read_per_join": "274K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "short_description",
        "full_description"
      ],
      "attached_condition": "((`nuie_scalesta_net`.`cscart_product_descriptions`.`product_id` in (101704,101705,101706,101707,101708,101709,101710,101711,101712,101713,101714,101715,101716,101717,101718,101719,101720,101721,101722,101723,101724,101725,101726,101727,101728,101729,101730,101731,101732,101733,101734,101735,101736,101737,101738,101739,101744,101745,101764,101765,101766,101767,101768,101769,101770,101771,101772,101773,101774,101775,101776,101777,101778,101779,101780,101781,101782,101783,101784,101785,101786,101787,101788,101789,101790,101791,101792,101793,101952,101953,101954,101955)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}