Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8335b1b8f85340e1c8b2c850c0f9bbcbc479dfac091b37c7b2312da1c86429af' 
  AND token = 'fa80xkm2R8f8cQ9nIPlXWH9VXlmAtyvtMYuYPBGGS3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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