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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf59c29a81171e5c530255914b2fe0657e7e0ecbad2dfae7bd7f033b2bb38dcc' 
  AND token = 'yYWdy/vtAs6p+MuNDtvPvSu+L4+q5MBatrKd2G/JKOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}