Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4046d47ecc5f5a2f021ada01916ff20678ec44b81d082b3ff8641b96ee77391' 
  AND token = 'UxEWC1IHYHbh+VWJ8nDd786bq1bh+JtpO5lbxkl36as=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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