SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f624c8132454869c9bfb78dea5617798a2a3cdfb0676640edf9a0392fec23699' 
  AND token = 'uNvTFBCa+oJuyHURbycgGRYBsRmIOJh28w9nitum/tw=' 
  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"
    }
  }
}