Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f76c92a52c3f93aee2f41d8cecb2108dafb08089d6a1890c729fadcfdeae7e71' 
  AND token = 'mrQLsvYhiEL7kRUsyV354T/DmBjJkn1oh6Hi69iYz40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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