SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '1a051e77a194694b7a4a1f59172ab6cf7de375bdd3e2cd562e1068ea17cd83bc' 
  AND token = 'KmWmpaS75s7hUVrY3+FsAq7tPumKqZ8C+YcZ9psBosA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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