Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3990211bed71ee5793f494175c7242f8f701a273e74988889fb9aa23eb1d9f08' 
  AND token = 'I69tKdxm1OQSg6ci/X3hZMq+lJizaQYtlyqSBuNof7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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