Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a8f92adc38241c46c40e5b64a6f8ac08dafcd985cd8ab7d3949ae44198c5297' 
  AND token = 'PeGU8fYpWsunjMG2xQC7KgWbME06uMksTr/NW3Yy1K8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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