Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dace5ef6a6d8c82c92f5a144e41e4cfa58fa5dea0b2ebe80689582d0d46b0ce0' 
  AND token = 'r8lZtwBddu/MXtQ3tp3OnoKw3Nf6SdRrYDkw3DEw+vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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