SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '7d395c734261809766c3bbf26c09e5cc71574e2dc6e526f4a4d9cc2db336599f' 
  AND token = 'qrUTfRTZaPlGLq44aE886T8Dz79WzgQ1TZYwrP+aGrc=' 
  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"
    }
  }
}