Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c1dfe223caf6e711c88be8bd35caaf1fec4c02c5b3e9499ecfd04eb09fa61ec' 
  AND token = 'DN9NOqvlJYIM/D3ENs8K9FWORETfdKswZSlGmSidWQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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