Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c7797900d878902c4cfc041c7e08718c928420240437d538e6c6e9aa4ca95dc' 
  AND token = '0ZLrtwXTmZZjNwk4Lxq9mrQoG/YoMMHE+DnF5Qjubbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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