SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc2586b73a190de816b959a0957ec5fad51518528ffc5f198d91b5c31227c223' 
  AND token = 'ezOVBcRQQav+KSp2KRzVvKwtF2mnrtGWpj9g97n/DFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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