Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91c1e3bd74bcc7e3e1cb7be5fd985d2acc3427b62dd3518089f8188fa66791a8' 
  AND token = 'fLu11OHtteNYMz8boX6hTU+2PmqK+BnIxrBGR6cX99s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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