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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5c3acebcf8cf3f06e1ae35d25b4aef93df4ccb4143f80b9116b5d80968c684a' 
  AND token = 'JSX7k4YpO/NdomrXwHAeMWHJlu1rXZG8szV5lXiUotY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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