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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b37e9b9d1009c1b974915fb075a990fe21fd3dbd6ccee3ca861c48d12eebb99' 
  AND token = '8nPNKZ9ZRqeZFLCw58mcW0GifuE1v+1K/x1ZrNHDIsk=' 
  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"
    }
  }
}