Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '847bfc207767d5e02a42e08612aa137c0d8d91d193b36a1307c4f2d58cb98874' 
  AND token = 'JxML9jqovzha0ef/ufCTym6znOc1gOkaZzTockx11Gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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