Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34159dcb0d7e64ab96a29cc83ce24b69e9f2201f6f2d4400c47f3737843f1789' 
  AND token = 'azmasS+8zT06pdfXaSz3AMep4JxmJaffEpd/wRWEopI=' 
  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"
    }
  }
}