Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f5252c66207b0e6690184bcef1e8f979cd54bd549bf54894c338dfc3e791707' 
  AND token = 'QHpkgfu6OE5V4DP7Q08p89LuoRVe5U9IeWU+gHHQKtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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