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 (
    99549, 99550, 99551, 99552, 99553, 99554, 
    99555, 99556, 99557, 99574, 99575, 
    99576, 100161, 100162, 100163, 100164, 
    100165, 100166, 100167, 100168, 100388, 
    100389, 100432, 100665, 100666, 100667, 
    100668, 100669, 100670, 100671, 100672, 
    100673, 101637, 101638, 101669, 101670, 
    101672, 101673, 101674, 101675, 101676, 
    101677, 101688, 101689, 101690, 101691, 
    101692, 101693, 101696, 101697, 101698, 
    101699, 101700, 101701, 101702, 101703, 
    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
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00159

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 (99549,99550,99551,99552,99553,99554,99555,99556,99557,99574,99575,99576,100161,100162,100163,100164,100165,100166,100167,100168,100388,100389,100432,100665,100666,100667,100668,100669,100670,100671,100672,100673,101637,101638,101669,101670,101672,101673,101674,101675,101676,101677,101688,101689,101690,101691,101692,101693,101696,101697,101698,101699,101700,101701,101702,101703,101704,101705,101706,101707,101708,101709,101710,101711,101712,101713,101714,101715,101716,101717,101718,101719,101720,101721,101722,101723,101724,101725,101726,101727,101728,101729,101730,101731,101732,101733,101734,101735,101736,101737,101738,101739,101744,101745,101764,101765)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}