SELECT 
  variant_id, 
  yml2_unit 
FROM 
  cscart_product_feature_variant_descriptions 
WHERE 
  variant_id IN (
    '9058', '9050', '9052', '9035', '8805', 
    '9054', '9031', '8807', '9070', '8809', 
    '9063', '9056', '9045', '9051', '8811', 
    '8812', '8813', '8815', '8816', '8819', 
    '8820', '9039', '8821', '8822', '8823', 
    '9068', '9041', '9079', '9047', '9064', 
    '9061', '9027', '8846', '8850', '8851', 
    '9044', '8853', '9055', '9062', '9078', 
    '9077', '8857', '8858', '9028', '8859', 
    '9069', '8860', '9071', '9042', '9030', 
    '9036', '8875', '8876', '8877', '9053', 
    '9060', '9065', '8881', '9080', '9040', 
    '9083', '9081', '9091', '9087', '9085', 
    '9082', '9090', '9086', '9084', '6967', 
    '6971', '6963', '6970', '6968', '6965', 
    '6966', '6969', '9106', '9139', '9120', 
    '9133', '9123', '9128', '9107', '9119', 
    '9141', '9140', '9118', '9135', '9097', 
    '9113', '7959', '9142', '9109', '9115', 
    '9105', '9096', '9116', '9093', '9101', 
    '9122', '9127', '9159', '9148', '9153', 
    '9151', '9149', '9158', '9155', '9161', 
    '9157', '9150', '9147', '9166', '9169', 
    '9172', '9167', '9163', '9165', '9162', 
    '9170', '9171', '9168'
  ) 
  AND lang_code = 'ru'

Query time 0.00193

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_product_feature_variant_descriptions",
      "access_type": "range",
      "possible_keys": ["PRIMARY"],
      "key": "PRIMARY",
      "key_length": "9",
      "used_key_parts": ["variant_id", "lang_code"],
      "rows": 123,
      "filtered": 100,
      "index_condition": "cscart_product_feature_variant_descriptions.variant_id in ('9058','9050','9052','9035','8805','9054','9031','8807','9070','8809','9063','9056','9045','9051','8811','8812','8813','8815','8816','8819','8820','9039','8821','8822','8823','9068','9041','9079','9047','9064','9061','9027','8846','8850','8851','9044','8853','9055','9062','9078','9077','8857','8858','9028','8859','9069','8860','9071','9042','9030','9036','8875','8876','8877','9053','9060','9065','8881','9080','9040','9083','9081','9091','9087','9085','9082','9090','9086','9084','6967','6971','6963','6970','6968','6965','6966','6969','9106','9139','9120','9133','9123','9128','9107','9119','9141','9140','9118','9135','9097','9113','7959','9142','9109','9115','9105','9096','9116','9093','9101','9122','9127','9159','9148','9153','9151','9149','9158','9155','9161','9157','9150','9147','9166','9169','9172','9167','9163','9165','9162','9170','9171','9168') and cscart_product_feature_variant_descriptions.lang_code = 'ru'"
    }
  }
}