SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c154f94417417f1f5a95c1f5c035018288297e5e37b581456362cac13bbec4a6' 
  AND token = 'ElV9PRP6y+J8sy4zHaO3BHh/YjKSxFS+mVoy/WIgwsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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