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 (
    100164, 100165, 100166, 100167, 100168, 
    100374, 100375, 100380, 100381, 100382, 
    100383, 100392, 100399, 100433, 100436, 
    100437, 100479, 100480, 100481, 100484, 
    100485, 100486, 100501, 100502, 100598, 
    100601, 100677, 100678, 100679, 100680, 
    100681, 100682, 100683, 100684, 100685, 
    100686, 100687, 100688, 100689, 100690, 
    100691, 100692, 100693, 100694, 100695, 
    100700, 100701, 100702, 100703, 100704, 
    100705, 100706, 100707, 100708, 100709, 
    100710, 100711, 100712, 100713, 100714, 
    100715, 100716, 100717, 100718, 100719, 
    100720, 100721, 100722, 100723, 100724, 
    100725, 100726, 100727, 100728, 100729, 
    100730, 100731, 100732, 100733, 100734, 
    100735, 100736, 100737, 100738, 100739, 
    100740, 100741, 100742, 100743, 100744, 
    100745, 100746, 100747, 100748, 100749, 
    100750
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00148

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "51.87"
    },
    "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": 96,
      "rows_produced_per_join": 96,
      "filtered": "100.00",
      "cost_info": {
        "read_cost": "42.27",
        "eval_cost": "9.60",
        "prefix_cost": "51.87",
        "data_read_per_join": "366K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "short_description",
        "full_description"
      ],
      "attached_condition": "((`nuie_scalesta_net`.`cscart_product_descriptions`.`product_id` in (100164,100165,100166,100167,100168,100374,100375,100380,100381,100382,100383,100392,100399,100433,100436,100437,100479,100480,100481,100484,100485,100486,100501,100502,100598,100601,100677,100678,100679,100680,100681,100682,100683,100684,100685,100686,100687,100688,100689,100690,100691,100692,100693,100694,100695,100700,100701,100702,100703,100704,100705,100706,100707,100708,100709,100710,100711,100712,100713,100714,100715,100716,100717,100718,100719,100720,100721,100722,100723,100724,100725,100726,100727,100728,100729,100730,100731,100732,100733,100734,100735,100736,100737,100738,100739,100740,100741,100742,100743,100744,100745,100746,100747,100748,100749,100750)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}