Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '647832417115eb0d98d2710cdbe6c5ba586c32d84ac53954dbda88f78ef1f1b6' 
  AND token = '7HrMmKKgohx6YqWq+mXp6RprZKW1RrzbXB66qyXEW9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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