SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9807a4620ee63433852e38f45d0bc815e2aaac0470976c9248f763b6b8dd12f1' 
  AND token = 'EBA+MOGEvm/WXBcHBwQH3hWABRi9IGsRTFGrtV3dxDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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