SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dcc167244d3ad2665246cc9c72d624a123d2745f2efa03436ddfcba8f411100' 
  AND token = 'jzlewOqRMEU3rJhiUV9tbYV+g6JKSYPjLIR5Jzhbb9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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