Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fbfb0a5031ddad2ad0d53ee4c48677e62074ce8eb774e0179ddec7bc6f4b8b5' 
  AND token = 'WFGalMB8OM8NCPLosqLhe1LmxpRCyhGuUmnLmJQlva4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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