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 (
    88172, 88220, 84778, 85673, 85693, 85705, 
    85717, 87551, 88404, 88658, 88700, 
    88705, 88747, 87448, 87460, 88492, 
    88500, 89453, 89466, 89474, 89482, 
    91434, 91442, 91448, 91456, 84764, 
    85659, 85681, 89019, 89104, 89112, 
    88752, 88794, 88795, 87504, 87520, 
    88444, 88462, 88478, 89458, 85728, 
    85745, 85755, 85765, 90831, 88553, 
    89976, 89977
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00121

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "21.63"
    },
    "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": "16.83",
        "eval_cost": "4.80",
        "prefix_cost": "21.63",
        "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 (88172,88220,84778,85673,85693,85705,85717,87551,88404,88658,88700,88705,88747,87448,87460,88492,88500,89453,89466,89474,89482,91434,91442,91448,91456,84764,85659,85681,89019,89104,89112,88752,88794,88795,87504,87520,88444,88462,88478,89458,85728,85745,85755,85765,90831,88553,89976,89977)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}