SELECT 
  cscart_product_descriptions.product_id, 
  cscart_product_descriptions.short_description, 
  IF(
    cscart_product_descriptions.short_description = '', 
    cscart_product_descriptions.full_description, 
    ''
  ) AS full_description, 
  cscart_product_descriptions.meta_keywords, 
  cscart_product_descriptions.meta_description, 
  cscart_product_descriptions.search_words, 
  cscart_product_descriptions.promo_text 
FROM 
  cscart_product_descriptions 
WHERE 
  cscart_product_descriptions.product_id IN (
    1232064, 1231839, 1108779, 2253664, 
    1231181, 1108820, 1238164, 1231476, 
    1153203, 1232163, 1129857, 1231065, 
    1231471, 1231473, 1231298, 1231261, 
    1231233, 1231283, 1231511, 1232091, 
    1162446, 2382472, 1231276, 1231645, 
    2382440, 1108777, 1231463, 1232020, 
    1231287, 1231046, 1231519, 1231908, 
    1231522, 1231260, 1129861, 1232123
  ) 
  AND cscart_product_descriptions.lang_code = 'ro'

Query time 0.00645

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "43.16"
    },
    "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": 36,
      "rows_produced_per_join": 36,
      "filtered": "100.00",
      "cost_info": {
        "read_cost": "39.57",
        "eval_cost": "3.60",
        "prefix_cost": "43.17",
        "data_read_per_join": "137K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "short_description",
        "full_description",
        "meta_keywords",
        "meta_description",
        "search_words",
        "promo_text"
      ],
      "attached_condition": "((`maniamall_cscart`.`cscart_product_descriptions`.`product_id` in (1232064,1231839,1108779,2253664,1231181,1108820,1238164,1231476,1153203,1232163,1129857,1231065,1231471,1231473,1231298,1231261,1231233,1231283,1231511,1232091,1162446,2382472,1231276,1231645,2382440,1108777,1231463,1232020,1231287,1231046,1231519,1231908,1231522,1231260,1129861,1232123)) and (`maniamall_cscart`.`cscart_product_descriptions`.`lang_code` = 'ro'))"
    }
  }
}

Result