SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ce0e10676504bd174bb22cef468eff4eb43622893b662a2d70a3e6d230122fc' 
  AND token = '9JFfkZsvrAsnPRizpfwZJj7h+QqjxtfwI1N1ppnYBwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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