SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbb6baa5f1c77762391e5b2faacda3ab7b1a376f980264902a3c84de4d03f3a7' 
  AND token = 'kZsbxPcqYFhkhAM0CBdvGtYJjwlnohdmx4Lg3c6h5qU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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