Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60f5bce46b507c61ffbb1538e99f98cf53fc3369f013d0556ae490fd6c566661' 
  AND token = 'ce1jDC/HEpLqfco91gwBULUFvyO31NXHt6sf+mQXd6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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