Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f0f69a7a9ea8d01e4e57e372d66bce84882ea1cc22560e2881c9d55e4657624' 
  AND token = 'DEdjBr+SFq9KKGk28tcLMnQdJAdPN58Jo36U67I07Hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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