SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22e2352c58bf4fe4f97ffbb952cde520233922d025f7366f392601e35d47d2d3' 
  AND token = 'zC+tmiH7qjUieKC8VlRF1tIypK1IJmX6gVGgiJrBbgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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