Sandbox

SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '2f27c3182aa683c15819cfd50d930049209a35fb45d1ae054ee97eafe2d11f47' 
  AND token = '1RnPWSYsGg9dQHIjtXF3ce0ZEhDHh/ipwy7g94pbj4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00007

JSON explain

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