SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e8de371f301afb8b22bad28b55e365fa335acd05cd4338d5e8dc771375593df' 
  AND token = '0LV63yWtB+vbtNGl+rYA95jhZPEmEgJHOt5wSFpzZJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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