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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69e8c53aff381a76d6d7cb418d4974bd0f2d196f329aa8df3eea0ea0d653d6bf' 
  AND token = 'WfIBVcrv1JFmKvwwj3TmeQMWyDbzhXkPdw943UHr5Vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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