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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1bfa9b4a41049ae9fae005b499708cd1f5036903cac72eb5d9feb9559f2925c' 
  AND token = 'X1sOj0tWs8VH2pt68HzVtA/gvka8SSRL9G6m6GjmVNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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