SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '325e327785acb0589268019f5225b1f2bcda81f23243dda709a322b1f293d767' 
  AND token = 'YMILE/gwW5gaCIP28wIhF+rQYmEZG000z8w/aVRGh+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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