Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0f122da5964a15d0ace436e94592b09f65a59595dc57397b570a92880a7de48' 
  AND token = 'YP57ftSRc4aw57qoW1eeroy55HyGDqE7arvOYfFYCHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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