Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '443c9bf84af3f2185d37dc70cc6f9ccb62141f09064c4c65d609951281093850' 
  AND token = 'xv99oj063ixwsXOWWtXY/O6bphw0JZp4sV73qkW9PNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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