Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7f5d7583be348d36c58472a9d469f32f7b237a4758849c9a3c5f75f293ed9ad' 
  AND token = 'XbkzHs5TN81ZajIFWyZ7EwjfKh8aOQMG5SFRyVR5B2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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