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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33f7fe73bc693a2266322931578fce326ef14036748c8f7307f6e49ee7db3786' 
  AND token = 'y2dK+jQ/MWDETC+0DwKuieLF81WEbxMZH9N23fbxDP0=' 
  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"
    }
  }
}