Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9ad9b19198bec38a90733a43119668af6a036aaa9e33a49c3a719e1b397d055' 
  AND token = '01Y+biaJd0ijNnLqqh1fjdfTlxoN2UgEcjy1N8GWoqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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