Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3a6aea6ca83c39a6471bf801e6627874cc7641ccb16a68439d853b4a6229ab3' 
  AND token = 'ADhl7Zj1eHHJQGhIEn9Rz0v0kjj1a+/07evSBz7WN8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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