SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '9691ebd121e62f43e8d93398775acf905f0f34b6676921848f2cce4d766ab5fb' 
  AND token = 'YfJS0jSlw/ZkQMhhxFIYETLWqRSd4THSVsR81/7jyvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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