SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '857f0153e03b99f4ad563c673f2d1627af873d286eeb28cf2b13461d5cb1cb95' 
  AND token = 'EJCufxcC/TgoBzb6P4OBxHIhiNDxRVNEPzl4+aIIctU=' 
  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"
    }
  }
}