Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c6d206c0817b4ea862ad14619a5bca303431fbb4fe671b02ef8fcf572213acb' 
  AND token = '8etDtyKuAp50EUbJOI1jcd5ODqjIY5fLGszNsB1LwOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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