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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce65f465af2ec135ae3bb96c89d7398b473a10dbc35b12b52d70073bd9ea338d' 
  AND token = 'D7WXi6F7Qzo0avwX6wdPuiRA9lbKxfNtFNELZ9R2ZyY=' 
  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"
    }
  }
}