SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cd2de0495fdaa8617d770b95104ff68b735c7004559c4238478a07b8224c83d' 
  AND token = 'Xs0olBPaNu4YyZju8J4hDjCHb0GfgHw+uk+z05ZbDLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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