SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb8239231c740ff64fc7c9d83087459881ec1f0c30d6e3fa43c956aa1b3be96b' 
  AND token = 'IjgagmJhn0SwPamM0yLQklozvbFHjCOrjwSKa/HuqFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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