Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf19f5be9fc04c80f5a2f6b64bbc6476c8d7db2e3ade558976be690c47acf95b' 
  AND token = 'a9+oVvO1zgpZEUVqWn6wOUv4dwFf2kC2T2/TrrIUg8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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