SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba854206fbf60f62a2297166f51c41bcd5393597292938405641db640803767c' 
  AND token = 'H4+Cpvq6Vus0Zi6K2e0DiiezlxXohWskrL7x1rWMFGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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