Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b6b79d45051f80675812aec0f0a471c49656e89fab36bdaf732c0ff39824efa' 
  AND token = 'seodXzqEatWw6nmE6JZJzHt3Ilv2VO24Kovt2LnHfsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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