SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b89024209eb104d837dc75235fffd398e2bf2154c7b003196253954ec25da816' 
  AND token = 'WMGH6CEzaV4p03Owb9K3Eg32K4lgvoLlbqQzBMZx+0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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