SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '793d3dc3c10b3900589a2418b7d3c9e9e664727e31b52cc1abeef926f7606f94' 
  AND token = 'WUREvz6uAVjx+aEnoJ8ZQrEc0/EuHY5DtsJqwK6nc+Q=' 
  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"
    }
  }
}