Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '826718c51dacc07389fcfa71afb483e4a14554e2bc406998a3c888fa86e02637' 
  AND token = '8HkihtMciWi3M9cGLuQ15Va9Oejern1CBJeu/a5vdZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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