Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e6671fd92e8eb299f415921bb0e9c3eff481fada0d6bb690bde6a56e5c71206' 
  AND token = 'F2iWy8Ce4+toPZpvD+0yAGckisUe9ZG1dJXpZECL9sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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