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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dd0d0c4a6164b4f03ef705163a4509894dffd72bdeb7373b12b847a930c33f2' 
  AND token = 'IEZ1Li7RFw9hAsDhlN+EY/vo6hY1hxxUrdoeAJS+ido=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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