Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bceb8f94d6399932f47b9f1cc74192b9b02c1a86e7c4880c32eb3c9e4409180' 
  AND token = 'yNox2HXq7p4ahWaX2X8lkYW6Ue9+MQ/A7WcqT21togQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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