Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5043e2de3691de231be6b76b1abaec5b4955a798d8d3aecb17184214e16f8681' 
  AND token = 'mPTqNwwrMORddhulgKlsmH4C3Dpfy7qmnw3gqz6P5FQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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