Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02a3e7e3c65aa5efa363ae447f0876d39a5b93040b01f44535f446f59a219f4d' 
  AND token = 'O3hNHVTnOdrtTZ1LjUjL8q2XVgb6qvFhRTS7FQRPvwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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