Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99aee3d6f291b4a809b0ef2565ee3b088f350fd502fa0843a682690cc7ab5a85' 
  AND token = 'UpEkFLQ2aW1hauXK04v1c/ojqtT+OOvxcrhC2e/kpeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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