Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83a016d01f8fbec1a4cf7bd0e0aa333ce72e54e5852ac726e064a396c640f1a9' 
  AND token = 'UmT6e6OUH6kdHhIojESsGqZ2GkfXDmaNQDx+Xkek+V0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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