SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '4cf9479d3ce8b190c88a6775f544c63b55d6deab5e7a66d47a2daa181f1eeb16' 
  AND token = 'U6NB///YtcBSz6zOlu3BK7RUHpLiaST/hr0LVosjITo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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