Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a439db049f9f1fdcb32b90f6d94d1f416cd18fdc1a7cf0b08e5fa3f43f89c2a5' 
  AND token = 'xlg234FUkhNeWbFnYRv5x1aK8Gct+ubfNkj+Z6PgOr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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