Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f39822c1f2ca79d93187344f3365da99b2ce738920d55c5ca39ee9600c0aff42' 
  AND token = 'aMBgRPtltrfmPEZhojQaOzoAEieqn7I8opQ+7al2mJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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