Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ca758de7fd4e9e034854440a95894d775363d648d487c156c190bc1e770abc9' 
  AND token = '0eybreybHghdYruG1IbHKYvkg1PX0pI6cwqZmVhCEgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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