Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c593962a42d44b7ec33fe6bcc53c662dfe2cd54243d0b91b6a6a943bf9ac657' 
  AND token = 'oQHpa1Ry2YmqmMmzY/9AP8MsgCZmzcnIW2fipOJByzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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