Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffcb532dc75851755f508c8fbf03327db72f879cc380a4c69a067cbc387a92b7' 
  AND token = '9f0qbpsE8qY3qyoKrk8qZKgNl7+QLHRXLPoPcGQoYw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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