SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'e539262e7b69a49c03349f17d5ca3850e315e2ea575474c28fa53dce9206e13f' 
  AND token = 'LwVHyKP6CKty5sxdCu8spp/gVdEzZcBZTOHG+kX6U1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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