Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c6bf38be3564b16ae649ca0d6a4faf8b0a644154b4c78fd891c7be7a071ded9' 
  AND token = 'MIG+eXvuLfYRnWcWty/wB8Uvd30Ef77Kko6xlAbcAsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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