Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7598478d8343ed9e4d6ec0717427930c512a3539bc027987f28034f947d112dc' 
  AND token = '3kPQhPWeijdwVnXv3JD2y9sOlX62HctBa+rrqPXA1ek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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