SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c65e473af1efc7e391e750483b9c09756fef4c9b1a43183eb01a22d5557a648' 
  AND token = 'udzt+rJZ4U34Mhi7EhHg5n2XedFqmC/iPYWlQZyScdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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