Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b16302ffd76e5df4949839e590ebec3824f1193661c712ffb512aad84ece3ce' 
  AND token = '3KIu9FHjsa5nsr9jRqvEbbQg1xf6SFrRSdtHD5NWpuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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