SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24accd9b87f2109e56419e4c283adf9825ac31b4f03d3f6f1a154508ef97a312' 
  AND token = 'FaNvQukfmbl1YSpRuax5itDREWPBhq69/VZIGxLLpVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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