SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aad7ef499d14182d8c1d6abd4fb4c545157e45a69992b574a9466025a08c72e1' 
  AND token = 'VNQhAYvClVUJLuri8sKcqoPkrUuZBZpwYtytmX9sloo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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