SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '372fc6479b3ce4cd0f27234a9768fa511859b380c68d36da6529fd24045b796b' 
  AND token = 'uHWahPkMJRYaGZMC8yUzqUZC55R7WJlHe02qkNCno7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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