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 (
    99492, 99493, 99494, 99495, 99496, 99497, 
    99498, 99499, 99500, 99501, 99502, 
    99503, 99504, 99505, 99506, 99508, 
    99512, 99516, 100399, 100479, 100480, 
    100481, 100484, 100485, 100486, 100501, 
    100502, 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, 100751, 100752, 100753, 
    100754, 100755, 100756, 100757, 100758, 
    100759, 100760, 100761, 100762, 100763, 
    100764, 100765, 100766, 100767, 100768
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00147

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "43.24"
    },
    "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": "33.64",
        "eval_cost": "9.60",
        "prefix_cost": "43.24",
        "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 (99492,99493,99494,99495,99496,99497,99498,99499,99500,99501,99502,99503,99504,99505,99506,99508,99512,99516,100399,100479,100480,100481,100484,100485,100486,100501,100502,100700,100701,100702,100703,100704,100705,100706,100707,100708,100709,100710,100711,100712,100713,100714,100715,100716,100717,100718,100719,100720,100721,100722,100723,100724,100725,100726,100727,100728,100729,100730,100731,100732,100733,100734,100735,100736,100737,100738,100739,100740,100741,100742,100743,100744,100745,100746,100747,100748,100749,100750,100751,100752,100753,100754,100755,100756,100757,100758,100759,100760,100761,100762,100763,100764,100765,100766,100767,100768)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}