Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0f12bd6bbb2da90a231f9f26f92531487f791967beec6aa46b9f3ea6d89d972' 
  AND token = 'go7N0UTzDg5jM+f0S9Sn26hYsWarVVpQfrIUX40++Wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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