Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd239d8e7f606bbfa51af3369adbe95d5f7fe42c32dc93cac86a4a5eef93b17f' 
  AND token = 'BulrAT4+JqrxPcbWMZBLWI3Ro+FuAnIlHWzWj8sHPO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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